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PREMISES AND EQUIPMENT - Schedule of Premises and Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross $ 328,940 $ 320,902  
Less accumulated depreciation and amortization 114,434 105,250  
Total premises and equipment 214,506 215,652  
Operating Leases, Rent Expense 11,200 9,100 $ 7,100
Land and land improvements [Member]      
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross 54,958 57,701  
Buildings [Member]      
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross 163,277 161,817  
Furniture and fixtures [Member]      
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross 74,881 66,567  
Leasehold improvements [Member]      
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross 31,728 29,086  
Construction in progress [Member]      
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross $ 4,096 $ 5,731